I am doing it too. I am having the spot weld flange cut off , and the entire back portion of the sail seam welded. the only issue i see here is that the targa top will now overhang the new finished edge on the targa bar.
It is hard to see in the pics, but i think it will look great in the finished product. They also had to re work the part of the sail panel where it flares out and lands on the rear quarter, or it is kind of an abrupt transition. (where the tabs for mounting the trim are)
check my progress thread and my blog for more pictures.